Disconnect the line cord at the rear panel and remove all test leads connected to the
instrument before replacing a line fuse. Failure to do so could expose the operator to
hazardous voltages that could result in personal injury or death.
To prevent injury, death, or instrument damage, use only the correct fuse type, as shown in
the following table.
To replace the line fuse:
1. Power off the instrument and remove the line cord.
2. The fuse drawer (item 1 in the following figure) is below the ac receptacle. A small tab is on the
top of the fuse drawer (item 2). Use a thin-bladed knife or a screwdriver to pry this tab away from
the ac receptacle.
Figure 57: Line fuse replacement
3. Slide the fuse drawer out to gain access to the fuse. The fuse drawer does not pull completely out
of the power module.
4. Snap the fuse out of the drawer and replace it with the same type.
5. Push the fuse drawer back into the module.
If a fuse continues to become damaged, a circuit malfunction exists and must be corrected. Return
the instrument to Keithley Instruments for repair.
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